The phrase refers to the ability, or perceived ability, to view content that has been removed from the Facebook platform by the user who originally posted it or by Facebook’s content moderation policies. An example would be attempting to access a status update, photo, or comment that is no longer publicly visible due to deletion.
The perceived desirability of accessing such information stems from various motivations, including recovering lost content, seeking evidence in disputes, or monitoring online activity. Historically, methods promising access to this data have been of considerable interest, often tied to software applications or online services making such claims. However, the effectiveness and legitimacy of these methods are frequently questionable.